21/(2y-3)=3

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Solution for 21/(2y-3)=3 equation: 


D( y )

2*y-3 = 0

2*y-3 = 0

2*y-3 = 0

2*y-3 = 0 // + 3

2*y = 3 // : 2

y = 3/2

y in (-oo:3/2) U (3/2:+oo)

21/(2*y-3) = 3 // - 3

21/(2*y-3)-3 = 0

21/(2*y-3)+(-3*(2*y-3))/(2*y-3) = 0

21-3*(2*y-3) = 0

30-6*y = 0

(30-6*y)/(2*y-3) = 0

(30-6*y)/(2*y-3) = 0 // * 2*y-3

30-6*y = 0

30-6*y = 0 // - 30

-6*y = -30 // : -6

y = -30/(-6)

y = 5

y = 5

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